.panel-h{
    text-align:center;
}
.canvas-box{
    position:absolute;
    top:45px;
    bottom:10px;
    left:100px;
    right:10px;
    overflow:hidden;
    box-shadow:1px 1px 5px #aaa;
}
.invisible{
    display:none;
}
.mouse-point{
    position:absolute;
    left:10px;
    top:50px;
}
.canvas-contextmenu{
    position: absolute;
    left: 0;
    top: 0;
    background: #f5f5f5;
    display: none;
    padding: 5px 0;
    border-radius: 5px;
    box-shadow: 1px 1px 8px rgba(0, 0, 0, 0.5);
}
.canvas-contextmenu li{
    font-size: 12px;
    line-height: 22px;
    padding: 0 10px;
    white-space: nowrap;
    cursor: pointer;
}
.canvas-contextmenu li:hover{
    background: #4c9cfb;
    color: #fff;
}
.unselectable{
    -moz-user-select: -moz-none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    -ms-user-select: none;
    user-select: none;
}